[petsc-dev] PetscHashIJ scaling problem?

[Matthew Knepley]

On Mon, Nov 11, 2013 at 4:02 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Matthew Knepley <knepley at gmail.com> writes:
> > I rewrote insertion for DMLabel to use the hash table, and convert to
> flat
> > arrays after insertion. Now its all linear:
>
> Nice.  Did you check how many hash operations per second this works out
> to?  Is this still the leading setup cost?
>

I did not check, but it would be interesting to check 3D since that it 4
part keys. It by far
the leading cost in mesh setup, but matrix preallocation is 3x more
expensive right now.

   Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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